DE1426792B2 - Overflow valve of a steam or gas turbine - Google Patents

Description

the partition 17 carried. Located between the intermediate floor 25 and the turbine shaft 13 a shaft labyrinth seal, which is not particularly shown.

The pivoting of the ring 14 takes place via a pivot lever 20, which is connected via a slot 21 a bolt 22 engages, which is provided in a bolt holder 27 of the ring 14.

While the ring 14 according to FIG. 1 brushes over the annular valve seat arrangement when the valve is opened and closed, with practically no propellant pressure forces acting on the ring 14, but only frictional forces in the area of the bearing ■■? (Bolt 16), the ring 28 according to FIG. 2, which is divided horizontally, moves away from the annular, coaxial seat 29 in the direction of the arrows 20 when it is opened. The reverse is also true. Here, too, no propellant pressure forces act on the ring 28, but only frictional forces on the bearing (see the bolts 31). The partition here consists of two ring-shaped, coaxial parts 32 and 33 which are connected to one another by means of ribs 34 and 26. The parts 32 and 33 are divided radially. The ring 28 is likewise divided radially.

These designs also cause the ring to vibrate when it is open or partially is in the open position, largely prevented.

1 sheet of drawings

Claims (1)

1 2 This overflow valve is intended for a turbine construction patent claim: art in which in a common housing a high pressure part and a low pressure part and Overflow valve, which is provided between a high- possibly other bladed parts pressure part and a low pressure part of a steam 5 are. or gas turbine is connected, between which the ring is in particular hydraulic or with Share propellant taken from the turbine servomotor power swiveled around said axis, is, and that within a turbine housing with more or less overflow cross-section is provided between these parts and as releases or the overflow valve completely Closure body encloses the turbine shaft. has benden ring, which is attached to one of the turbine It is already through the German patent shaft surrounding, 'fixed partition wall 583 610 the torque-free mounting of a pivotable is stored, known thereby identifiable valve body. It is about draws that the ring (14, 28) around a but around a flap, which is used to regulate the vol-diameter of the ring (14, 28) as the axis (15) 15 len passage cross-section of a pipeline in is rotatably mounted in a torque-free manner. such is built in. It needs to be installed a completely free installation space not available in the case of a turbine because of the rotor shaft; in addition, it requires large actuators to open ao power. It is therefore not suitable for the purpose according to the invention and cannot be used by any simple modifications for it redesigned The invention relates to an overflow valve. . · ~ " til, which is between a high pressure part and a In the drawing are exemplary embodiments of the Low-pressure part of a steam or gas turbine is switched in a turbine, between which parts propellant is shown in longitudinal section. ·
the turbine is removable, and that within a According to FIGS. 1 and 2 is a not shown Turbine housing between these parts provided high pressure part of an axial steam turbine with 10 and is and as a closure body the turbine shaft is a low-pressure part of this turbine, not shown has surrounding ring, which is designated by the turbine 30 with 11 on one. According to FIG. 1 is located inside the shaft surrounding, fixed partition half of the turbine housing 12 is movable as a closure body is stored. by an overflow valve serving ring 14, the Such an arrangement is radially undivided by the USA patent, which surrounds the turbine shaft 13 and Document 1 613 868 became known. whose ideal axis with the ideal axis 23 of the The well-known overflow valve is as coincident on a 35 turbine shaft. This ring 14 is over Thread rotatable ring executed. Here is the axis 15, which has a diameter of the ring 14 particularly disadvantageous that for the sake of rapid representation and is perpendicular to the plane of the drawing, Controllability and simple operation of the pivotable, namely by using bolt 16 gela overflow valve the thread is Gert with a large pitch, which is carried out in a radial undivided intermediate must be, which is why the wall 17 is because of 4 °. This partition 17 is over of the thread basically there is a risk that an annular groove-annular spring connection 24 with the Tursich the valve ring, e.g. B. also connected with the aid of the connector housing 12. The partition 17 Impurities, stuck in the propellant, still separates the high-pressure part 10 from the low-pressure part 11 is raised. in relation to the propellant. The propellant can In addition, clamping can also be achieved by 45 when the ring 14 is pivoted (see fig Corrosion occurs especially after standstills. dot-dash position), from high pressure part 10 In addition, it is not at all easy to flow appropriately into the low-pressure part 11 via slots 19, Nete actuators, the implementation of which by being the slots 19 from the ring 14 only partially the turbine housing must be kept tightly covered, so the swivel angle is smaller than sen, to be provided. This is due to the fact that a solid line of paint 50 is shown in dash-dotted lines, then a point of the handle flows of the actuators on the valve ring compared to a smaller amount of propellant in the Niederbei an adjustment of the same per se on pressure part 11, the withdrawal amount being greater than would move in a circular path. It is there so is before. a moving point of attack. intended; but the partition 17 thus has a valve seat nevertheless, there is only a relatively small angle of rotation 55 of order 18, which makes the turbine shaft 13 annular of the valve ring possible, which means that it escapes and corresponds to the ring 14. Dader the controllability is very poor or that the slots 19 extend in the circumferential direction Such a large pitch of the thread provide device and follow several such in this direction must that the risk of jamming no perfect slots 19 on each other over 360 °. It can about allows more free operation. 60 360 ° e.g. six slots 19 or elongated holes The object of the invention is to provide an arrangement for being arranged in a distributed manner. The slots 19 are insbeein To create overflow valve, which is a simple special evenly distributed over the circumference or and flawless actuation with the largest possible over 360 °. The partition Control capability and control accuracy made possible. 17 is undivided radially. She has no horizontal This task is performed with an overflow valve of 65 or some other radial parting line.
initially specified type according to the invention characterized in the intermediate wall 17 is a co- solved that the ring around a diameter of the axial intermediate bottom 25, which is radial, namely hori-ring is rotatably mounted as an axis without torque. zontal, is divided. This intermediate floor 25 is of